海藻の原形質に関する研究-II : アサクサノリの「アナグサレ病」について

概要

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In the previous paper, the authors reported the remarkable resemblance between “perforating disease” and deformation of laver-cells caused by mechanical, chemical or osmotic action of the environments. When a part of Porphyra-frond is injured mechanically by a tip of needle and then put into diluted sea water or fresh-water, protoplasm of operated cells coagulates very easily and the stimu-lation effect spreads gradually into the non-touched surrounding cells resulting in deformation. The aspect of deformed cell and the width of deformed area vary with the concentration of media in which the operated piece is immerced; i.e. it does not occur in hypertonic water of more than about 12‰, C1, between 10-12‰ C1 the deformation is inconsiderable, and in less than 10‰ C1 it continues for some periods with intence grade, especially under6-8‰ Cl the deformed area decomposes into a hole. In the cultur ground the disease often occurs after vigorous rain, especially along the place near estuary. From these, it is concluded that the so-called “perforating disease” is a non-parasitic disease. It seems to be brought about by a physiological disturbance by the plasmoptyse of cells accompanied decreased permeability in plasma-memblane and increased viscosity in plasma owing to the injure and hypotonic media. The disease “shirogusare” reported by Arasaki (1947) also seems to have some affinity with the present disease, in the pathogenetic sence.